Alteration of E2F2 Expression in Governing Endothelial Cell Senescence

Area of Science:

• Vascular Biology
• Cellular Senescence
• Molecular Biology

Background:

• Endothelial cell senescence contributes to vascular dysfunction, age-related cardiovascular diseases like hypertension and atherosclerosis.
• E2F transcription factor 2 (E2F2) is crucial for cell cycle regulation and DNA repair.
• The role of E2F2 in vascular endothelial cell senescence remains unexplored.

Purpose of the Study:

• To investigate the involvement of E2F2 in endothelial cell senescence.
• To elucidate the molecular mechanisms by which E2F2 influences endothelial cell aging and function.

Main Methods:

• Examined E2F2 expression in senescent human umbilical vein endothelial cells (HUVECs) and aged mouse aortas.
• Performed E2F2 knockdown and overexpression in HUVECs to assess senescence markers (SA-β-gal, p-eNOS, SIRT1, SASP IL-6/IL-8).
• Analyzed cell cycle, DNA damage, proliferation, and downstream target gene expression (CNNA2, CDK1, FOXM1).

Main Results:

• E2F2 expression decreased in senescent endothelial cells and aged aortas.
• E2F2 knockdown induced premature senescence, cell cycle arrest, DNA damage, and inhibited proliferation.
• E2F2 overexpression reversed senescence phenotypes and restored cellular function and target gene expression.

Conclusions:

• E2F2 plays a critical role in regulating endothelial cell senescence.
• E2F2 deficiency promotes vascular aging, while its restoration can ameliorate senescence.
• E2F2 is a potential therapeutic target for age-related vascular dysfunction.